That sucks man. The only trade of those that was remotely close to vetoable was the Estrada/K-Rod for Morneau trade and even that one is questionable. None of the others had any business being vetoed. Clearly there are people in your league that don't understand what the veto function is for.

Add my voice to the chorus: this is ridiculous. Those are all perfectly fine trades. I thank my lucky stars that I'm in a keeper league with 11 friends I trust to be reasonable and fair. I have no idea how I'd keep my sanity playing with lame owners like this. Good luck finding a better league, man.